+undef $for_destroy;
+SKIP: {
+ skip 'only testing lsof(8) output on Linux', 1 if $^O ne 'linux';
+ my $lsof = require_cmd('lsof', 1) or skip 'no lsof in PATH', 1;
+ my $rdr = { 2 => \(my $null_err) };
+ my @d = grep(m!/xap[0-9]+/!, xqx([$lsof, '-p', $$], undef, $rdr));
+ is_deeply(\@d, [], 'no deleted index files') or diag explain(\@d);
+}